A soft metal or nonmetal sleeve, designed to mate with a pin-rivet. it may include an external wrenching facility which breaks off at a perdetermined torque to form a head.
NSN 4140-01-323-8629
NSN 6685-01-303-1673
NSN 2925-00-005-1618
NSN 5905-01-191-5910
NSN 6135-00-603-4859
NSN 2925-01-484-8556
NSN 5930-01-601-9528
NSN 5855-00-237-4088
NSN 6105-01-485-1846
NSN 2925-00-923-4397
NSN 5990-01-503-0194
NSN 5999-01-406-4571